Kakuro

Language:

4x4: easy intermediate hard challenging expert
6x6: easy intermediate hard challenging expert
8x8: easy intermediate hard challenging expert
9x11: easy intermediate hard challenging expert
9x17: easy intermediate hard challenging expert

Kakuro is like a crossword puzzle with numbers. Each "word" must add up to the number provided in the clue above it or to the left. Words can only use the numbers 1 through 9, and a given number can only be used once in a word. Every kakuro puzzle has one and only solution, and can be solved through logic alone.

Kakuro Blog
Kakuro Rules
Kakuro Tutorials: Basic Challenging

Kakuro Hint: Not sure what a number is yet? Fill in its remaining possible values -- the cell will automatically resize to accommodate.

		25	7		10	16		23	8
	13			14 13			11 23
	41 4
9			12 16			17 12
12				3	15 24			21	10
	17	19 15					11
13			10				13 28
16			22	19 13
	12					11 4
	26	10 13			7 25			19
11				15 18					6
34						10	14
15			11				9 10
9			20 24					18	4
		17 24			12	12 13
	17 10			14 14			4 7
44
9			13			14

Free online kakuro puzzles